古代中国人把道德经叫什么经？

— I didn't hear you come in last night.      

— That's good. We tried ______ noisy. [ ]

A. not be

B. not to be

C. to be

D. to be not

Do you know if he _______ back in two hours? [ ]

A. will be

B. comes

C. has been

光谱方案的理论依据是（）的多元智力理论。

美国各州鲜葡萄都可以进口。 ( )

亲水性表明固体颗粒被水润湿难易程度，通常用接触角Q表示，Q＜90°表示（）。

A.完全润湿

B.能润湿

C.不能润湿